Preparation and characterisation of novel casein-gum Arabic composite microcapsules for targeted in vivo delivery of Lactiplantibacillus plantarum A3.

The health benefits of probiotics in the body are predicated on their ability to remain viable in harsh gastrointestinal conditions and complex pathological microenvironments. Casein and gum Arabic (GA), with dual emulsifying and stabilising effects in colloidal systems. Therefore, the objective of this research was to develop a novel microcapsule to encapsulate Lactiplantibacillus plantarum A3 using casein and GA as wall materials to improve the survival of the bacteria during gastrointestinal digestion, storage and lyophilization. The casein and GA composite microcapsules were prepared and characterised by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and scanning electron microscopy (SEM). It was found that the microcapsules had stable morphology, uniform size and spherical shape. The results revealed that the encapsulation of microcapsules significantly improved the survival of L. plantarum A3 in gastrointestinal fluid environment (5.52 × 109 cfu/ml) and lyophilization treatment (6.25 × 109 cfu/ml). Furthermore, the microencapsulated L. plantarum A3 exhibited an improved ability to regulate intestinal microbiota by effectively increasing the relative abundance of Bacteroidetes, Proteobacteria and Actinobacteria and decreasing the relative abundance of Firmicutes in vivo. The findings of the study will help to design a lactic acid bacteria encapsulation system based on the gastrointestinal environment and provide a basis for the development of probiotic functional products.

[Effect of enhanced recovery after surgery on surgical stress response in patients with gastric cancer complicated with type 2 diabetes mellitus].

Objective: To investigate the effect of enhanced recovery after surgery on the stress response of gastric cancer patients complicated with type 2 diabetes mellitus. Methods: We retrospectively analyzed the data of 49 patients with type 2 diabetes who underwent radical gastrectomy for gastric cancer in the Department of gastroenterology of the Affiliated Hospital of Jiangsu University from Jan to Dec 2020. They were randomly divided into experimental group and control group according to different perioperative management measures. The perioperative C-reactive protein (CRP), white blood cell (WBC), interleukin-6(IL-6), insulin resistance (HOMA-IR), blood glucose fluctuation and postoperative recovery were compared between the two groups. Results: A total of 49 patients were enrolled in the study (23 in the experimental group and 26 in the control group). The degree of stress reaction of the experimental group was lighter than that of the control group. The levels of CRP were significantly different on the 5th and 7th day after operation, IL-6 was significantly different on the 1st, 3rd, 5th and 7th day after operation, WBC and HOMA-IR were significantly different on the 1st day postoperatively. And the changes of HOMA-IR and blood glucose in experimental group were more gentle than those in control group. All the differences were statistically significant(P<0.05). In the experimental group, the time of first anal exhaust, indwelling time of drainage tube or nasointestinal tube and the total hospitalization time were significantly shorter than those of the control group(P<0.05). Conclusion: ERAS can reduce the degree of inflammatory stress and the postoperative IR level promote the early recovery of patients with gastric cancer complicated with type 2 diabetes mellitus.

Connecting particle interactions to agglomerate morphology and rheology of boehmite nanocrystal suspensions.

HYPOTHESIS: The rheology of complex suspensions, such as nuclear waste slurries at the Hanford and Savannah River sites, imposes significant challenges on industrial-scale processing. Investigating the rheology and connecting it to the agglomerate morphology and underlying particle interactions in slurries will provide important fundamental knowledge, as well as prescriptive data for practical applications. Here, we use suspensions of nano-scale aluminum oxyhydroxide minerals in the form of boehmite as an analog of the radioactive waste slurry to investigate the correlation between particle interactions, agglomerate morphology, and slurry rheology. EXPERIMENTS: A combination of Couette rheometry and small-angle scattering techniques (independently and simultaneously) were used to understand how agglomerate structure of slurry changes under flow and how these structural changes manifest themselves in the bulk rheology of the suspensions. FINDINGS: Our experiments show that the boehmite slurries are thixotropic, with the rheology and structure of the suspensions changing with increasing exposure to flow. In the slurries, particle agglomerates begin as loose, system-spanning clusters, but exposure to moderate shear rates causes the agglomerates to irreversibly consolidate into denser clusters of finite size. The structural changes directly influence the rheological properties of the slurries such as viscosity and viscoelasticity. Our study shows that solution pH affects the amount of structural rearrangement and the kinetics of the rearrangement process, with an increase in pH leading to faster and more dramatic changes in bulk rheology, which can be understood via correlations between particle interactions and the strength of particle network. Nearly identical structural changes were also observed in Poiseuille flow geometries, implying that the observed changes are relevant in pipe flow as well.

Upregulation of long noncoding RNA LEF1-AS1 predicts a poor prognosis in patients with esophageal squamous cell carcinoma.

OBJECTIVE: Recent studies have suggested that long noncoding RNAs (lncRNAs) are involved in various tumors. The present research was designed to examine the prognostic values of a newly identified lncRNA, lncRNA LEF1-AS1 (LEF1-AS1), in esophageal squamous cell carcinoma (ESCC). PATIENTS AND METHODS: The relative levels of LEF1-AS1 in ESCC tissues and normal esophageal tissues were examined by applying quantitative Real Time-Polymerase Chain Reaction (qRT-PCR). The relations between LEF1-AS1 expressions and clinical factors were analyzed by conducting the Chi-square test. The Kaplan-Meier assay was used for assays of the overall survival (OS) and disease-free survival (DFS) dates. Univariate and multivariate analyses were applied for the identification of the independent prognostic factors for ESCC. RESULTS: We showed that LEF1-AS1 was distinctly upregulated in ESCC tissues compared with the matched normal tissues (p < 0.01). Higher levels of LEF1-AS1 were associated with lymph nodes metastasis (p = 0.009) and clinical stage (p = 0.008). Clinical investigation revealed that ESCC patients with high LEF1-AS1 level showed a significant shorter 5-year OS (p = 0.0028) and DFS (p = 0.0025). Multivariate analyses confirmed LEF1-AS1 as an independent prognostic parameter indicating unfavorable clinical prognosis for ESCC patients. CONCLUSIONS: The present study suggested that LEF1-AS1 could be a novel ESCC-related lncRNA involved in the clinical progression of ESCC, which may be used as a potential predictor.

Highly selective resolution of racemic 1-phenyl-1,2-ethanediol by a novel strain Kurthia gibsonii SC0312.

Chiral 1-phenyl-1,2-ethanediol (PED) performs vital effect for the preparation of pharmaceuticals, agrochemicals and cosmetics. In the study, a newly isolated strain Kurthia gibsoniiSC0312 with the ability to selectively oxidize racemic PED to achieve (S)-PED was evaluated in the aqueous reaction system. The strain showed excellent catalytic performances within the range of pH 5·5-8·5, temperature 25-45°C and the amount of cell 15 mg ml-1 to 30 mg ml-1 . Besides, 2-hydroxyacetophenone (HAP) as the oxidation product displayed a stronger inhibition to the catalytic activity of cell, only remaining <63% of catalytic activity after incubation at 40 mmol l-1 HAP for 6 h. For various metal ions, Cu2+ can obviously improve 1·7 times of the catalytic activity of cell at the concentration of 0·2 mmol l-1 . Acetone can stimulate the catalytic capacity of cell to improve the optical purity of (S)-PED at the PED concentration of 80 mmol l-1 , up to appropriately 94% from 85·4%; compared to the resting cell, growing cell exerted no positive effect in the yield and optical purity. Finally, a highly effective kinetic resolution system of racemic PED by the new strain was obtained, with the (S)-PED yield of 41% and optical purity of 94%. SIGNIFICANCE AND IMPACT OF THE STUDY: Biocatalyst is a vital component in the process of biotransformation. There are a growing number of studies of biocatalyst reporting the preparation of enantiomer of 1-phenyl-1,2-ethanediol. And the performance of this preparation reaction is also gradually improving. This study is the first to demonstrate that Kurthia gibsonii can efficiently and selectively oxidize racemic 1-phenyl-1,2-ethanediol, and we assess the effect of various factors on the catalytic performance of the strain. The work adds to a growing body of evidence for using biocatalytic method in the synthesis of chiral 1-phenyl-1,2-ethanediol and provides a probable approach to mine excellent properties of enzymes.

Expression and prognostic significance of long noncoding RNA AK001796 in esophageal squamous cell carcinoma.

OBJECTIVE: Previous study has reported that long noncoding RNA AK001796 (AK001796) functions as a tumor promoter in esophageal squamous cell carcinoma (ESCC). However, its clinical in ESCC patients remains largely unclear. The purpose of the present study was to evaluate the prognostic value of AK001796 in ESCC patients. PATIENTS AND METHODS: The expression levels of AK001796 in ESCC tissues and matched normal tissues were detected by RT-PCR. Association between AK001796 levels and clinicopathological factors was also analyzed by chi-square test. Overall survival (OS) and disease-free survival (DFS) were analyzed using the Kaplan-Meier method and log-rank test. The predictors for OS and DFS were assessed by univariate analysis and multivariate analysis using Cox's proportional hazards model. RESULTS: We found that AK001796 was elevated in human ESCC samples compared with the adjacent normal tissues (p<0.01), and the high level of AK001796 expression was significantly correlated with lymph node metastasis (p=0.032) and advanced UICC stage (p=0.016). Interestingly, Kaplan-Meier analysis indicated that patients with high AK001796 expression had a significantly lower OS (p=0.010) and DFS (p=0.001). Moreover, we showed that AK001796 was an independent poor prognostic factor for OS and DFS in ESCC patients through univariate and multivariate analysis. CONCLUSIONS: Our data provide important evidence that AK001796 may be a useful biomarker of advanced progression and poor prognosis of ESCC.

Differentiation between malignant and benign breast masses: combination of semi-quantitative analysis on DCE-MRI and histogram analysis of ADC maps.

AIM: To investigate the performance of combined semi-quantitative analysis on dynamic contrast enhanced (DCE) magnetic resonance imaging (MRI) and histogram analysis of diffusion-weighted imaging (DWI) for distinguishing malignant from benign breast masses. MATERIALS AND METHODS: This study included 178 patients with breast masses (benign:malignant=88:9) who underwent both DCE-MRI and DWI. The semi-quantitative parameters, derived from DCE-MRI, included maximum slope of increase (MSI), signal intensity slope (SIslope), initial percentage of enhancement (Einitial), percentage of peak enhancement (Epeak), early signal enhancement ratio (ESER), and second enhancement percentage (SEP). Histogram parameters derived from apparent diffusion coefficient (ADC) maps included ADCmin, ADCmax, ADCmean, ADC10, ADC25, ADC50, ADC75, ADC90, skewness, and kurtosis. All parameters were compared between malignant and benign groups, and their differences were tested using independent-samples t-test or Mann-Whitney test. Receiver operating characteristic (ROC) curves were used to determine the diagnostic value of each significant parameter. RESULTS: Among semi-quantitative parameters, SIslope exhibited the best diagnostic performance in predicting malignancy (cut-off value, 0.096; ROC, 0.756; sensitivity, 86.7%; specificity, 61.4%). Among histogram parameters, ADC10 exhibited the best diagnostic performance in predicting malignancy (cut-off value, 1.051; ROC, 0.885; sensitivity, 86.7%; specificity, 84.1%). The optimal diagnostic performance of combined ADC10 and SIslope (area under curve [AUC], 0.888; sensitivity, 82.2%; specificity, 95.5%) was significantly better than SIslope alone (p<0.001). Moreover, the combination showed higher AUC (0.888 versus 0.885) than ADC10 alone, but the difference was not statistically significant (p=0.914). CONCLUSION: SIslope and ADC10 are significant predictors for breast malignancy. The combination of DCE-MRI and DWI improves differentiating performance.

Efficient biocatalytic stereoselective reduction of methyl acetoacetate catalyzed by whole cells of engineered E. coli.

Asymmetric synthesis of chiral ß-hydroxy esters, the key building blocks for many functional materials, is currently of great interest. In this study, the biocatalytic anti-Prelog reduction of methyl acetoacetate (MAA) to methyl-(R)-3-hydroxybutyrate ((R)-HBME) was successfully carried out with high enantioselectivity using the whole cell of engineered E. coli, which harbored an AcCR (carbonyl reductase) gene from Acetobacter sp. CCTCC M209061 and a GDH (glucose dehydrogenase) gene from Bacillus subtilis 168 for the in situ regeneration of the coenzyme. Compared with the corresponding wild strain, the engineered E. coli cells were proved to be more effective for the bio-reduction of MAA, and afforded much higher productivity. Under the optimized conditions, the product e.e. was >99.9% and the maximum yield was 85.3% after a reaction time of 10 h, which were much higher than those reported previously. In addition, the production of (R)-HBME increased significantly by using a fed-batch strategy of tuning pH, with a space-time yield of approximately 265 g L-1 d-1, thus the issue in previous research of relatively low substrate concentrations appears to be solved. Besides, the established bio-catalytic system was proved to be feasible up to a 150 mL scale with a large-scale relatively high substrate concentration and selectivity. For further industrial application, these results open a way to use of whole cells of engineered E. coli for challenging higher substrate concentrations of ß-ketone esters enantioselective reduction reactions.

Citrullinated vimentin stimulates proliferation, pro-inflammatory cytokine secretion, and PADI4 and RANKL expression of fibroblast-like synoviocytes in rheumatoid arthritis.

OBJECTIVES: We aimed to investigate the possible effects of vimentin (Vim) and citrullinated Vim (cVim) on proliferation capacity, pro-inflammatory cytokine secretion, and the expression of peptidylarginine deiminase type 4 (PADI4) and receptor activator of nuclear factor kappa B ligand (RANKL) in cultured fibroblast-like synoviocytes (FLSs) from rheumatoid arthritis (RA) and osteoarthritis (OA) patients. METHOD: Human native Vim was citrullinated with rabbit PAD in vitro and detected using a Western blot assay with anti-modified citrulline antibody (anti-MC Ab). FLSs from RA or OA synovial samples were stimulated with Vim or cVim. Cell proliferation capacity was determined using the Celltiter 96 AQueous cell proliferation assay. The concentrations of tumour necrosis factor (TNF)-α, interleukin (IL)-1, and IL-17 were measured by enzyme-linked immunosorbent assay (ELISA). The expression of PADI4 and RANKL was measured by real-time polymerase chain reaction (RT-PCR) and a Western blot assay. RESULTS: Our Western blot assay with anti-MC Ab indicated that the amount of cVim increased significantly after Vim had been incubated with rabbit PAD in vitro. The proliferation capacity and secretion of TNF-α and IL-1 were significantly enhanced in the FLSs of RA patients when treated with cVim. However, when treated with Vim, an inhibitory effect on the proliferation capacity was noted in the FLSs from RA and also from OA patients. cVim significantly increased the expression of PADI4 and RANKL in the FLSs from RA patients. CONCLUSION: cVim seems to have remarkable biological effects on RA as confirmed by the stimulation of proliferation capacity, pro-inflammatory cytokine secretion, and PADI4 and RANKL expression in the FLSs of RA patients.

Characterization of EPG waveforms for the tea green leafhopper, Empoasca vitis Göthe (Hemiptera: Cicadellidae), on tea plants and their correlation with stylet activities.

The stylet probing activities of the tea green leafhopper Empoasca vitis Gothe (Hemiptera: Cicadellidae) were studied using the DC electrical penetration graph (EPG) technique. Seven different EPG waveforms (i.e., Np, E1, E2, E3, E4, E5 and E6) were distinguished and characterized on susceptible tea leaves. In addition, four of them (i.e., Np, E1, E2, E3), together accounting for 97.08% of the total recording time, were behaviorally correlated with probing and non-probing activities using artificial diet observation with high-magnification video recording. At the start of stylet probing, waveform E1 always occurred at a variable voltage. E1, with all three of its waveform sub-types (E1-A to E1-C), was correlated with production of the salivary sheath trunk, stylet laceration, and channel cutting in viscous artificial diet. Afterwards, two types of high-amplitude waveforms, E2 and E3, followed. E2 had a highly regular, quasi-square wave, repetitive appearance, and lasted the longest duration of all E. vitis probing waveforms. E3 usually appeared after E2, and also exhibited a quasi-square wave feature similar to E2, but had much higher amplitude. Both waveforms E2 and E3 were correlated with active ingestion in liquid artificial diet. In addition, secretion of watery, enzymatic saliva was likely during E2. The active stylet movements and channel-cutting observed during the probing process indicate that E. vitis is a cell rupture feeder, not a salivary sheath feeder, as aphids and other leafhoppers. Thus, hopperburn damage to the tea plant is probably due to the cell rupture feeding strategy, similar to other hopperburning Empoasca species.

Analysis of energy utilization and body composition in kidney, bladder, and adrenal cancer patients.

OBJECTIVE: To investigate resting energy expenditure (REE) and body composition and the relationship between substrate utilization and energy expenditure in urologic cancer patients. PATIENTS AND METHODS: Measured resting energy expenditure (mREE) was detected by indirect calorimetry in 122 urologic cancer patients and 131 control subjects. Extracellular fluid (ECF), intracellular fluid (ICF), and total water (TW) were measured by bioelectrical impedance appliance. Fat oxidation rate (F-O), carbohydrate oxidation rate, fat mass (FM), and fat free mass (FFM) were further determined. RESULTS: Compared with the controls, cancer patients showed significantly elevated mREE and mREE/FFM (P = 0.049; P < 0.001). Of all the cancer patients, 50% (n = 61) were hypermetabolic, 43.4% (n = 53) normometabolic, and 6.6% (n = 8) hypometabolic, whereas 35.1% (n = 46) of the controls were hypermetabolic, 56.5% (n = 74) normometabolic, and 8.4% (n = 11) hypometabolic. REE was correlated to substrate oxidation rate (R(2) = 0.710). Cancer patients exhibited no significant difference in FM, FM/body weight (BW) and FFM, compared with controls. Cancer patients presented no significant difference in TW compared with controls (P = 0.791), but they had increased ECF (P < 0.001) and decreased ICF (P < 0.001). CONCLUSION: Aberrations in substrate utilization may contribute to the elevated energy expenditure in urologic cancer patients. Cancer type and pathologic stage are influential factors of REE.

Mind the information gap: fertility rate and use of cesarean delivery and tocolytic hospitalizations in Taiwan.

BACKGROUND: Physician-induced demand (PID) is an important theory to test given the longstanding controversy surrounding it. Empirical health economists have been challenged to find natural experiments to test the theory because PID is tantamount to strong income effects. The data requirements are both a strong exogenous change in income and two types of treatment that are substitutes but have different net revenues. The theory implies that an exogenous fall in income would lead physicians to recoup their income by substituting a more expensive treatment for a less expensive treatment. This study takes advantages of the dramatic decline in the Taiwanese fertility rate to examine whether an exogenous and negative income shock to obstetricians and gynecologists (ob/gyns) affected the use of c-sections, which has a higher reimbursement rate than vaginal delivery under Taiwan's National Health Insurance system during the study period, and tocolytic hospitalizations. METHODS: The primary data were obtained from the 1996 to 2004 National Health Insurance Research Database in Taiwan. We hypothesized that a negative income shock to ob/gyns would cause them to provide more c-sections and tocolytic hospitalizations to less medically-informed pregnant women. Multinomial probit and probit models were estimated and the marginal effects of the interaction term were conducted to estimate the impacts of ob/gyn to birth ratio and the information gap. RESULTS: Our results showed that a decline in fertility did not lead ob/gyns to supply more c-sections to less medically-informed pregnant women, and that during fertility decline ob/gyns may supply more tocolytic hospitalizations to compensate their income loss, regardless of pregnant women's access to health information. CONCLUSION: The exogenous decline in the Taiwanese fertility rate and the use of detailed medical information and demographic attributes of pregnant women allowed us to avoid the endogeneity problem that threatened the validity of prior research. They also provide more accurate estimates of PID.JEL Classification: I10, I19, C23, C25.

Declining fertility and the use of cesarean delivery: evidence from a population-based study in Taiwan.

OBJECTIVE: To test the hypothesis that declining fertility would affect the number of cesarean sections (c-sections) on maternal demand, but not medically indicated c-sections. DATA SOURCES: The 1996-2004 National Health Insurance Research Database in Taiwan for all singleton deliveries. STUDY DESIGN: Retrospective population-based, longitudinal study. Estimation was performed using multinomial probit models. PRINCIPAL FINDINGS: Results revealed that declining fertility had a significant positive effect on the probability of having a c-section on maternal request but not medically indicated c-section. CONCLUSIONS: Our findings offer a precautionary note to countries experiencing a fertility decline. Policies to contain the rise of c-sections should understand the role of women's preferences, especially regarding cesarean deliveries on maternal request.

A functional haplotype and expression of the PADI4 gene associated with increased rheumatoid arthritis susceptibility in Chinese.

To evaluate the association of single-nucleotide polymorphisms (SNPs) in PADI4 mRNA with rheumatoid arthritis (RA) in a Chinese population, we examined the distribution of four exonic SNPs of the PADI4 gene (padi4_89*G/A, padi4_90*T/C, padi4_92*G/C and padi4_104*T/C) and PADI4 gene expression in 70 RA patients and 81 controls. Increased RA susceptibility was associated with the minor alleles of padi4_89 (P = 0.012), padi4_90 (P = 0.002), padi4_104 (P = 0.001) and the functional haplotype carrying the four minor alleles (P = 0.008). Human leukocyte antigen (HLA)-DRB1 shared epitope (SE) alleles were also associated with increased RA susceptibility, and the individuals with minor alleles of four exonic SNPs and SE alleles showed more increased RA susceptibility. The PADI4 expression was significantly higher in RA patients than in controls (P < 0.001). HLA-DRB1 SE alleles and the genotypes carrying the minor alleles of four SNPs were associated with increased PADI4 expression. It is concluded that PADI4 SNPs, functional haplotype and PADI4 expression may contribute to an inherited predisposition to RA in a Chinese population.

Efficient lipid production with Trichosporon fermentans and its use for biodiesel preparation.

Effects of medium components and culture conditions on biomass and lipid production of Trichosporon fermentans were studied. The optimal nitrogen source, carbon source and C/N molar ratio were peptone, glucose and 163, respectively. The favorable initial pH of the medium and temperature were 6.5 and 25 degrees C. Under the optimized conditions, a biomass of 28.1 g/l and a lipid content of 62.4% could be achieved after culture for 7 days, which were much higher than the original values (19.4 g/l and 50.8%) and the results reported by other groups. T. fermentans could grow well in pretreated waste molasses and a lipid yield of 12.8 g/l could be achieved with waste molasses of 15% total sugar concentration (w/v) at pH 6.0, representing the best result with oleaginous microorganisms on agro-industrial residues. Addition of various sugars to the pretreated molasses could efficiently enhance the accumulation of lipid and the lipid content reached as high as above 50%. Similar to vegetable oils, the lipid mainly contains palmitic acid, stearic acid, oleic acid and linoleic acid and the unsaturated fatty acids amount to about 64% of the total fatty acids. The microbial oil with an acid value of 5.6 mg KOH/g was transesterified to biodiesel by base catalysis after removal of free fatty acids and a high methyl ester yield of 92% was obtained.

Improvement of biodiesel production by lipozyme TL IM-catalyzed methanolysis using response surface methodology and acyl migration enhancer.

The process of biodiesel production from corn oil catalyzed by lipozyme TL IM, an inexpensive 1,3-position specific lipase from Thermomyces lanuginosus was optimized by response surface methodology (RSM) and a central composite rotatable design (CCRD) was used to study the effects of enzyme dosage, ratio of t-butanol to oil (v/v) and ratio of methanol to oil (mol/mol) on the methyl esters (ME) yield of the methanolysis. The optimum combinations for the reaction were 25.9U/goil of enzyme, 0.58 volume ratio of t-butanol to oil and 0.5, 0.5, 2.8 molar equivalent of methanol to oil added at the reaction time of 0, 2, and 4h, respectively, by which a ME yield of 85.6%, which was very close to the predicted value of 85.0%, could be obtained after reaction for 12h. Waste oil was found to be more suitable feedstock, and could give 93.7% ME yield under the optimum conditions described above. Adding triethylamine (TEA), an acyl migration enhancer, could efficiently improve the ME yield of the methanolysis of corn oil, giving a ME yield of 92.0%.

Comparative proteomic analysis for the detection of biomarkers in pancreatic ductal adenocarcinomas.

AIMS: To search for novel potential protein biomarkers for the early detection and better intervention of pancreatic ductal adenocarcinoma (PDAC). METHODS: Eight pairs of matched PDAC and non-cancerous pancreas tissues were profiled with two-dimensional electrophoresis; differentially expressed proteins were identified by mass spectrometry. Expression patterns of TBX4 (T-box transcription factor TBX4) and HSP60 (60 KDa heat shock protein) were studied with immunohistochemistry using tissue microarrays. RESULTS: A total of 48 differentially expressed proteins were identified; 30 of them are novel potential biomarkers. Immunohistochemistry showed that TBX4 expression could be seen in both centroacinar cells and small ducts in normal pancreas and tumour cells in 5/5 (100%) well differentiated, 35/38 (92.1%) moderately differentiated, and 11/18 (61.1%) poorly differentiated PDAC tissues with different staining intensity. However, in normal acinar cells and tumour cells in the other 3/38 (7.9%) moderately differentiated and 7/18 (38.9%) poorly differentiated PDAC tissues, there was no visible TBX4 expression. The expression difference of TBX4 between moderately differentiated and poorly differentiated PDAC tissues was statistically significant (p<0.01). In addition, there was obvious morphology difference between TBX4 negatively stained and positively stained tumour cells, which suggests different cellular origins. Strong expression of HSP60 could be seen in both acinar cells and small ducts in normal pancreas tissues and tumour cells in PDAC tissues except for islets and tumour stoma; no correlation was found between HSP60 expression and differentiation of PDAC tissues. CONCLUSIONS: 30 novel potential biomarkers differentially expressed in PDAC tissues were identified. TBX4 may be a differentiation related protein; its prognostic value for PDAC deserves further study.

Kinetic resolution of organosilicon compounds by stereoselective dehydrogenation with horse liver alcohol dehydrogenase.

Stereoselective dehydrogenation of three isomers of trimethylsilylpropanol was carried out with horse liver alcohol dehydrogenase (HLADH, EC 1.1.1.1.) and optically active organosilicon compounds were obtained in a water-organic solvent two-layer system with coenzyme regeneration. Furthermore, we examined the effects of the silicon atom on stereoselectivity of HLADH compared to the corresponding carbon compounds. Substitution of the silicon atom for the carbon atom was found to improve the stereoselectivity of HLADH. For example, the optical purity of the remaining 1-trimethylsilyl-2-propanol was higher than 99% enantiomeric excess (ee) at 50% conversion, whereas that of the carbon analogue was 84% ee. This phenomenon was probably ascribable to the bulkiness of the organosilicon compounds derived from their longer Si-C bond. Kinetic analysis in an aqueous monolayer system demonstrated that the specific properties of the silicon atom greatly affected the reactivity of these substrate compounds.